Cutting machine

ABSTRACT

To provide a cutting machine that suppresses swinging of the cutting portion when the battery pack is attached or detached, the cutting machine includes a cutting portion, a base, and a swing support mechanism. The cutting portion includes: a motor, a motor housing accommodating the motor, an output shaft configured to be rotated upon rotation of the motor, a battery pack serving as a power source of the motor, and a battery pack attaching portion including a pair of rail portions with which the battery pack is engageable, where a cutting blade is configured to be detachably attached to the output shaft. The base has a contact surface on which a workpiece is configured to be placed. The swing support mechanism is connected to the base and the cutting portion and includes a swing shaft extending in parallel to the output shaft. The swing support mechanism supporting the cutting portion such that the cutting portion is swingable about the swing shaft between a top dead center and a bottom dead center in a direction parallel to a side surface of the cutting blade. The pair of rail portions extend in a direction crossing the side surface of the cutting blade.

CROSS-REFERENCES TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.15/577,628, filed Nov. 28, 2017, which claims priorities from JapanesePatent Application Nos. 2015-109864, filed May 29, 2015. The entirecontents of the above noted applications are incorporated herein byreference. Incidentally, the U.S. application Ser. No. 15/577,628 isentered into U.S. national phase from International Application No.PCT/JP2016/063519 filed Apr. 29, 2016 in Japan Patent Office as aReceiving Office, which claims the above described priority.

TECHNICAL FIELD

The present invention relates to a cutting machine, and morespecifically, to a cutting machine to which a battery pack is detachablyattached.

An electric motor disclosed in Patent Document 1 includes a cuttingportion, and a base portion having a sub battery. The cutting portionincludes a motor, a circular saw blade driven by the motor, and a mainbattery. The cutting portion is connected to a base portion via a hingeto be swingable, and is supported to be sildable by two guide bars fixedand supported in parallel above the base portion. By swinging ortranslate (sliding) the cutting portion with respect to the baseportion, cutting operation is performed. The main battery is detachablyattached to the cutting portion by being slid in the front-reardirection in accordance with a rail structure in the cutting portion.

PATENT LITERATURE

-   Patent Document 1: Japanese Patent Application Publication No.    2014-144508

SUMMARY OF INVENTION Technical Problem

In the conventional electric motor, since the attachment-detachmentdirection of the main battery (battery pack) is parallel to the sidesurface of the circular saw blade, when the main battery is attached ordetached, the cutting portion may swing or translate (slide) withrespect to the base portion, and it is difficult to perform theattaching and detaching operation of the battery. Further, when theattachment and detachment of the main battery is performed in a statewhere a workpiece is placed on the base portion, the cutting portionswings or translates with respect to the base portion. Thus, theworkpiece and the circular saw blade can be brought into contact witheach other and the material to be machined may be damaged.

An object of the invention is to provide a cutting machine thatsuppresses movement of the cutting portion when the battery pack isattached or detached.

Solution to Problem

To give a solution to the above technical problem, the inventionprovides a cutting machine including a cutting portion, a base, and aswing support mechanism. The cutting portion includes: a motor, a motorhousing accommodating the motor, an output shaft configured to berotated upon rotation of the motor, a battery pack serving as a powersource of the motor, and a battery pack attaching portion including apair of rail portions with which the battery pack is engageable, where acutting blade is configured to be detachably attached to the outputshaft. The base has a contact surface on which a workpiece is configuredto be placed. The swing support mechanism is connected to the base andthe cutting portion and includes a swing shaft extending in parallel tothe output shaft. The swing support mechanism supporting the cuttingportion such that the cutting portion is swingable about the swing shaftbetween a top dead center and a bottom dead center in a directionparallel to a side surface of the cutting blade. The pair of railportions extend in a direction crossing the side surface of the cuttingblade

According to the above configuration, since the attachment-detachmentdirection of the battery pack is the direction crossing the swingingdirection, the cutting portion is hard to move (swing) at the time ofattaching and detaching the battery pack, and it is easy to perform theattaching and detaching operation of the battery pack. Further, damageto the workpiece placed on the base can be reduced.

Preferably, the battery pack attaching portion is disposed in the motorhousing.

According to the above configuration, by providing the battery packattachment portion in the motor housing, the number of components can bereduced, and the cutting portion can be downsized. Therefore, thebattery pack attachment portion can be manufactured and assembled with asimple structure. Further, when lead wires are wired from the batterypack attachment portion to the motor, since wiring can be performedwithout passing through other housings, the structure can be simplifiedand the assembling also can be facilitated.

It is preferable that the motor housing is constituted by at least twosplit pieces each having a mating surface parallel to an axial directionof a rotating shaft of the motor, and that the pair of rail portionshave one rail and another rail those individually positioned atdifferent ones of the at least two split pieces. The at least two splitpieces contact with each other at the mating surfaces,

According to the above configuration, the rail portion can bemanufactured without dividing in the attachment-detachment direction ofthe battery pack. Therefore, the accuracy of the rail portion issecured, and the battery pack can be smoothly attached and detached.

Preferably, the cutting machine further includes a connecting terminaldisposed in the battery pack attaching portion and interposed betweenthe at least two split pieces. The connecting terminal is electricallyconnected to the motor.

According to the above configuration, since the connecting terminal isassembled so as to be interposed by at least two split pieces, there isno need for a metal fitting for mounting the connecting terminal to themotor housing. Therefore, the motor housing can be easily assembled,while reliably holding the connecting terminal.

Preferably, the cutting machine further includes a display portionconfigured to display remaining capacity of the battery pack, and thedisplay portion is interposed between the at least two split pieces.

According to the above configuration, since the battery remainingcapacity display portion is assembled so as to be interposed by at leasttwo split pieces, there is no need for a metal fitting for mounting thebattery remaining capacity display portion to the motor housing. Thus,the motor housing can be easily assembled, while reliably holding thebattery remaining capacity display portion.

Preferably, the motor is a brushless motor including a stator fixed inthe motor housing, and the cutting machine further includes an invertercircuit configured to control the stator and output of the motor. Theinverter circuit is disposed within an overall length of the batterypack in the axial direction of the rotating shaft of the motor.

According to the above configuration, since each component is disposedso as to be accommodated within the overall length of the battery pack,the cutting machine can be downsized with the reduced full width.

Preferably, the cutting portion further includes an operating handle anda conveying handle. The operating handle includes a trigger configuredto be operated by an operator to turn on and off the motor. Theoperating handle and the conveying handle are arrayed in the directionparallel to the side surface of the cutting blade. The battery packattaching portion is disposed between the operating handle and theconveying handle in the direction parallel to the side surface of thecutting blade.

According to the above configuration, since the battery pack attachmentportion is provided between the conveying handle and the operatinghandle, the distance from the battery pack attachment portion to bothhandles becomes shorter. Accordingly, it is facilitated to grasp one ofthe handles and stabilize the cutting portion at the time of attachmentand detachment of the battery pack.

Preferably, the battery pack attached to the battery pack attachingportion is positioned below the conveying handle when the cuttingportion is positioned at the bottom dead center.

According to the above configuration, since the battery pack is locatedbelow the conveying handle in a state where the cutting portion is fixedat the bottom dead center position (at the time of conveyance), thecutting machine can be downsized by decreasing its entire height whenthe cutting machine is conveyed.

Preferably, the cutting machine further includes a sliding supportingmechanism slidably supporting the cutting portion in a sliding directionparallel to the contact surface. The pair of the rail portions extend ina direction perpendicular to the sliding direction when the cuttingportion is positioned at the bottom dead center.

Preferably, the sliding supporting mechanism includes a slide pipeslidably supporting the cutting portion.

According to the above configuration, the attachment-detachmentdirection and the sliding direction of the battery pack are differentfrom each other. Therefore, the cutting portion is hard to move (slide)when attaching and detaching the battery pack, and the battery pack canbe easily attached and detached. Further, damage to the workpiece placedon the base can be suppressed.

Preferably, each of the motor and the battery pack attaching portion isarrayed in a direction perpendicular to the output shaft.

According to the above configuration, the cutting machine can bedownsized by decreasing its axial dimension.

Advantageous Effects of Invention

Regarding the cutting machine according to the invention, the cuttingportion can be suppressed from moving when the battery pack is attachedor detached.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a table-top cutting machine according to afirst embodiment of the invention in a state where a cutting portion ispositioned at a spaced position;

FIG. 2 is a front view of the table-top cutting machine according to thefirst embodiment of the invention in a state where a battery pack isdetached from the table-top cutting machine;

FIG. 3 is a perspective view of the cutting portion of the table-topcutting machine according to the first embodiment of the invention;

FIG. 4 is a perspective view of the table-top cutting machine accordingto the first embodiment of the invention in a state where a first motorhousing is detached from the cutting portion;

FIG. 5 is a plan view of the table-top cutting machine according to thefirst embodiment of the invention in a state where the first motorhousing is detached from the cutting portion;

FIG. 6 is a side view of the table-top cutting machine according to thefirst embodiment of the invention in a state where the cutting portionis positioned at a proximity position;

FIG. 7 is an exploded perspective view of a motor housing of thetable-top cutting machine according to the first embodiment of theinvention;

FIG. 8 is a perspective view of the cutting portion of the table-topcutting machine according to the first embodiment of the invention in astate where the battery pack is detached from the cutting portion;

FIG. 9 is a block diagram of the table-top cutting machine according tothe first embodiment of the invention;

FIG. 10 is a side view of a table-top cutting machine according to asecond embodiment of the invention in a state where a cutting portion ispositioned at a spaced position;

FIG. 11 is a front view of the table-top cutting machine according tothe second embodiment of the invention in a state where a battery packis detached from the table-top cutting machine; and

FIG. 12 is a side view of the table-top cutting machine according to thesecond embodiment of the invention in a state where the cutting portionis positioned at a proximity position.

DESCRIPTION OF EMBODIMENTS First Embodiment

A desktop cutting machine according to an embodiment of the inventionwill be described below with reference to FIGS. 1 to 9. A table-topcutting machine 1 as an example of the cutting machine illustrated inFIG. 1 mainly includes a base portion 2, a support portion 3 connectedto the base portion 2, and a cutting portion 4 supported by the supportportion 3. The cutting portion 4 includes a housing 5, a motor 6equipped with a motor output shaft 61 (FIG. 7), an output shaft 7 drivenby the motor 6, a cutting blade 8 detachably mounted on the output shaft7, and a battery pack attachment portion 10 (FIG. 2) on which thebattery pack 9 is detachably mounted. The support portion 3 is anexample of the swing support mechanism of the invention. The motoroutput shaft 61 is an example of the rotating shaft of the invention.

In FIG. 1, the side on which the cutting portion 4 is provided withrespect to the base portion 2 is defined as the upward direction, andthe reverse side thereof is defined as the downward direction. A sheetright side of FIG. 1 is defined as the front side, and the reverse sidethereof is defined as the back side. As illustrated in FIG. 2, theleft-right direction viewed from the front side is defined as the rightdirection and the left direction, respectively. In the followingdescription, when referring to a direction such as the upward direction,it includes not only the identical upward direction but also asubstantially upward direction.

The cutting portion 4 is capable of swinging about (as an axis) a swingshaft 35A (a shaft extending in the left-right direction) to bedescribed later which is parallel to the output shaft 7, with respect tothe base portion 2. Specifically, the cutting portion 4 is capable ofswinging between a spaced position at which the cutting blade 8 and thebase portion 2 illustrated in FIG. 1 are farthest from each other and aproximity position at which the cutting blade 8 illustrated in FIG. 6 islocated at the lowest position. The spaced position is an example of thetop dead center of the invention, and the proximity position is anexample of the bottom dead center of the invention.

The cutting portion 4 can tilt with respect to the base portion 2 aboutan tilting shaft portion 27A (extending in the front-rear direction) tobe described later that is orthogonal to the output shaft 7. Asillustrated in FIG. 2, when viewed from the front side, the cuttingportion 4 can tilt with respect to the base portion 2 in a clockwisedirection R and a counterclockwise direction L to be described later. Asillustrated in FIG. 1, the cutting portion 4 is movable in a slidingdirection S (the front-rear direction) with respect to the base portion2. The detailed configuration thereof will be described later.

The base portion 2 has a base 21, a turntable 22 disposed on the base21, a fence 23 provided on the base 21, and a vise device 26 for fixinga wood piece W. The upper surfaces of the base 21 and the turntable 22form a contact surface 25 on which the wood piece W is placed. Asillustrated in FIG. 2, the base 21 is composed of a pair of a left base21A and a right base 21B.

As illustrated in FIGS. 1 and 2, the turntable 22 is rotatable around arotation shaft (not illustrated) extending in the vertical directionwith respect to the base 21, and is disposed between the right base 21Band the left base 21A. The turntable 22 includes: a turntable main bodyportion 22A having a substantially circular truncated cone shape, aprotruding portion 24 protruding forward from the turntable main bodyportion 22A, and a housing support portion 27 which supports the supportportion 3. A groove portion (not illustrated) is formed on the uppersurface of the turntable 22. The groove portion (not illustrated) islocated at the same position as an intersection position when thecutting blade 8 swings downward and intersects with the turntable 22 ina side view. The cutting edge of the cutting blade 8 is accommodated inand passes along the groove portion.

The protruding portion 24 is provided with a restricting operationportion 28 which restricts the pivoting of the turntable 22 with respectto the base 21. The restricting operation portion 28 is supported by theprotruding portion 24, and includes a grasping portion 28A and arestricting portion 28B. The grasping portion 28A can be grasped by anoperator and extends forward from the protruding portion 24. Therestricting portion 28B is screwed forward and backward by therotational operation of the grasping portion 28A to be movable insidethe protruding portion 24 in the front-rear direction, and includes arear end surface capable of abutting against and being spaced apart fromthe base 21. When the rear end surface of the restricting portion 28B ispressed against the base 21, the turntable 22 is fixed to the base 21and the pivoting of the turntable 22 with respect to the base 21 issuppressed.

The vise device 26 includes a vise shaft 26A extending in the verticaldirection, a screw holder 26B, and a knob 26C. The screw holder 26B isprovided on the vise shaft 26A so as to be movable in the verticaldirection, and the distance from the contact surface 25 can be adjusteddepending on the size of the wood piece W. By operating the knob 26C,the wood piece W can be fixed to the vise device 26.

As illustrated in FIG. 1, the housing support portion 27 is disposed atan opposite position (the position rotated by 180□ about a rotatingshaft (not illustrated)) of the protruding portion 24 with respect tothe rotation shaft (not illustrated) of the turntable 22. That is, thehousing support portion 27 is disposed behind the turntable 22. Thehousing support portion 27 has a tilting shaft portion 27A located on anextension line of a groove portion (not illustrated) of the turntable 22and extending in the front-rear direction, and a tilting support portion27B upstanding upward from the rearmost end portion. The housing supportportion 27 is an example of the tilt angle adjusting mechanism of theinvention.

As illustrated in FIG. 2, the tilting support portion 27B is formed withan arcuate elongated hole 27 b penetrating in the front-rear directionand centered on the tilting shaft portion 27A. A clamp 31A to bedescribed later is inserted into the elongated hole 27 b. A set pin 29serving as a positioning member at right angles is mounted to thetilting support portion 27B so as to be capable of being pulled out inthe front-rear direction. In a state in which the set pin 29 isinserted, the cutting portion 4 can tilt only in the counterclockwisedirection L. In a state in which the set pin 29 is pulled out, thecutting portion 4 can tilt in the clockwise direction R and thecounterclockwise direction L. The tilting shaft portion 27A is anexample of the tilting shaft of the invention.

The fence 23 is provided on the base 21 and at the upper position of theturntable 22. As illustrated in FIG. 2, the fence 23 has a left fence23A and a right fence 23B respectively corresponding to the left base21A and the right base 21B, and the front surfaces of the left fence 23Aand the right fence 23B are disposed to be located on the same plane toposition the wood piece W (FIG. 1).

As illustrated in FIGS. 1 and 2, the support portion 3 has a holder 31,a slide support portion 33, a swinging support portion 35, and a slideportion 36. The holder 31 is supported by the housing support portion 27via the tilting shaft portion 27A. A clamp 31A is screwed to the holder31, and the clamp 31A is inserted into the elongated hole 27 b (FIG. 2)of the tilting support portion 27B. By tightening the clamp 31A, theholder 31 is fixed to the tilting support portion 27B. That is, thecutting portion 4 cannot tilt in the counterclockwise direction L andthe clockwise direction R illustrated in FIG. 2. By loosening the clamp31A, the holder 31 can be tilted about the tilting shaft portion 27A.That is, the cutting portion 4 can tilt in the counterclockwisedirection L and the clockwise direction R illustrated in FIG. 2. Sincethe clamp 31A is inserted into the elongated hole 27 b, the angle atwhich the holder 31 can tilt with respect to the tilting support portion27B is limited to the range within which the clamp 31A can move in theelongated hole 27 b.

The slide support portion 33 has two guide bars 33A and 33B. Each of theguide bars 33A and 33B is in the form of a pipe having substantially thesame shape, and is arranged in parallel to the vertical direction. Eachof the guide bars 33A and 33B is parallel to the upper surface (contactsurface 25) of the base portion 2, and is fixed to the holder 31 suchthat their respective axial directions coincide with the front-reardirection. Specifically, these guide bars 33A and 33B are fixed to theholder 31 in a non-detachable manner by bolts (not illustrated) screwedinto the holder 31, respectively. The slide support portion 33 is anexample of the sliding supporting mechanism of the invention. The guidebars 33A and 33B are an example of slide pipes.

At the front end portions of the guide bars 33A and 33B, a connectingmember 33C is provided. The guide bars 33A and 33B are connected to eachother through the connecting member 33C. Specifically, two holesextending in the front-rear direction are formed in the connectingmember 33C, and the front end portions of the guide bars 33A and 33B areinserted into and fixed to the holes, respectively.

The swinging support portion 35 has a swing shaft 35A extending in theleft-right direction and a pair of swinging wall portions 35B extendingin the vertical direction in the rear view. The swinging support portion35 is configured to move integrally with the slide portion 36. The swingshaft 35A is bridged between a pair of swinging wall portions 35B andswingably supports the cutting portion 4. A spring (not illustrated) ismounted to the swinging support portion 35 to urge the cutting portion 4in the direction from the proximity position to the spaced position.

As illustrated in FIG. 2, the slide portion 36 is formed with twothrough-holes extending in parallel to the front-rear direction, and theguide bars 33A and 33B are inserted into the through-holes,respectively. When the slide portion 36 slides with respect to the guidebars 33A and 33B, the swinging support portion 35 can move in thesliding direction S (front-rear direction). That is, the cutting portion4 can move in the sliding direction S along the guide bars 33A and 33B.An operation knob 36A, which is screwed forward and can protrude intothe slide portion 36, is threadedly engaged with the slide portion 36.By screwing the operation knob 36A to advance and press the guide bar33A against the slide portion 36, the slide portion 36 can be fixed tothe guide bars 33A and 33B.

As illustrated in FIGS. 1 and 2, the housing 5 has a motor housing 50,an operating handle 53, a conveying handle 54, a gear accommodatingportion 55, and a saw cover 56. The motor housing 50 houses the motor 6(FIG. 7) therein, and is provided with a battery pack attachment portion10, a display unit 57, and a connecting terminal 58 electricallyconnected to the battery pack 9. In order to suppress the drive sound ofthe table-top cutting machine 1 and to suppress the consumption ofenergy in the battery pack 9, the display unit 57 is provided with achangeover switch 57A and a battery remaining capacity display switch57B. The changeover switch 57A is for switching to a silent mode forcontrolling the rotational speed of the motor 6 with a low speedrotation. The battery remaining capacity display switch 57B is fordisplaying the remaining capacity of the battery pack 9. The displayunit 57 is disposed on the left end surface of the motor housing 50. InFIGS. 3, 4, 7, 8, 10, and 12, illustrations of the changeover switch 57Aand the battery remaining capacity display switch 57B are omitted. InFIGS. 7 and 8, the connecting terminal 58 is not illustrated.

As illustrated in FIG. 7, the motor housing 50 is a split type(two-split) housing including a first motor housing 51 and a secondmotor housing 52. The first motor housing 51 and the second motorhousing 52 are examples of the split pieces of the invention.

The first motor housing 51 includes a first mating surface 51A thatabuts against the second motor housing 52, a first rail portion 51Bcapable of engaging with the battery pack 9, and a plurality of firstscrew hole portions 51 c. The first motor housing 51 is formed with afirst electrode groove 51 a and a first display groove 51 b. The firstrail portion 51B extends in parallel to the motor output shaft 61, andprotrudes toward the second motor housing 52. The first electrode groove51 a and the first display groove 51 b are formed so as to be recessedin a direction orthogonal to the motor output shaft 61. The plurality offirst screw hole portions 51 c form a boss shape protruding from thefirst mating surface 51A, are formed with a female screw, and are formedin a direction orthogonal to the motor output shaft 61.

The second motor housing 52 includes a second mating surface 52A thatabuts against the first mating surface 51A, a second rail portion 52Bcapable of engaging with the battery pack 9, and a wall portion 52C. Inthe second motor housing 52, a second electrode groove 52 a, a seconddisplay groove 52 b, and a plurality of second screw holes 52 c areformed. The first mating surface 51A and the second mating surface 52Ahave a structure in which they abut against each other on a planeextending in parallel to the motor output shaft 61. That is, the firstmating surface 51A, the second mating surface 52A, and the motor outputshaft 61 are parallel to each other when viewed from a directionorthogonal to the motor output shaft 61. In the structure of theembodiment, the motor output shaft 61 is located on a plane includingthe first mating surface 51A and the second mating surface 52A. Thesecond rail portion 52B extends in parallel with the motor output shaft61 and protrudes toward the first motor housing 51. The first matingsurface 51A and the second mating surface 52A are examples of the matingsurface of the invention. The first rail portion 51B and the second railportion 52B are examples of the rail portion of the invention.

The wall portion 52C rotatably supports the motor output shaft 61. Awall portion (not illustrated) is also provided on the first motorhousing 51, and a space for accommodating the motor 6 is defined byabutment between a wall portion (not illustrated) and the wall portion52C. The second electrode groove 52 a and the second display groove 52 bare formed so as to be recessed in a direction orthogonal to the motoroutput shaft 61. When the first motor housing 51 and the second motorhousing 52 are coupled to each other in a state where the motor 6, thedisplay unit 57, and the connecting terminal 58 are disposed inside, theconnecting terminal 58 is interposed by the first electrode groove 51 aand the second electrode groove 52 a, and the display unit 57 isinterposed by the first display groove 51 b and the second displaygroove 52 b. The plurality of second screw holes 52 c are capable ofreceiving the bosses of the first screw hole portions 51C, and penetratethrough the second motor housing 52 in a direction orthogonal to themotor output shaft 61.

When the first motor housing 51 and the second motor housing 52 arecoupled to each other, the first rail portion 51B and the second railportion 52B extend in parallel with the motor output shaft 61,respectively, and the battery pack attachment portion 10 is formed inthe motor housing 50. The first motor housing 51 and the second motorhousing 52 are fixed to each other when a screw (not illustrated)penetrates through the corresponding second screw hole 52 c and isscrewed with a female screw of the first screw hole portion 51C. A screw(not illustrated) is inserted from the second motor housing 52 towardthe first motor housing 51. As a result, since the first screw holeportion 51C and the second screw hole 52 c open substantially downward,accumulation of dust can be prevented in the respective holes.

The battery pack attachment portion 10 and the motor 6 are disposed in adirection orthogonal to the output shaft 7 with respect to the outputshaft 7. In other words, as illustrated in FIGS. 3 and 4, the batterypack 9, the battery pack attachment portion 10, and the motor 6 aredisposed radially outward of the cutting blade 8. The battery pack 9 isattachable to and detachable from the battery pack attachment portion 10along the direction (attachment-detachment direction D) in which thefirst rail portion 51B and the second rail portion 52B extend. Asillustrated in FIG. 2, the extension direction of the first rail portion51B and the second rail portion 52B, that is, the attachment-detachmentdirection D is the left-right direction. In other words, theattachment-detachment direction D is orthogonal to the sliding directionS of the cutting portion 4 in the front view. When mounting the batterypack 9, the battery pack 9 is inserted in the right direction in thefront view. When the tilting motion of the cutting portion 4 is allowedonly in the counterclockwise direction L by the set pin 29, the mountingdirection (right direction) of the battery pack 9 is substantiallyopposite to the tilting direction of the cutting portion 4. When thebattery pack 9 is mounted in the attachment-detachment direction D inthe state of FIG. 2, since the tilting motion in the clockwise directionR is restricted, the cutting portion 4 can be prevented from beingtilted in the clockwise direction R when the battery pack 9 is attached.

As illustrated in FIG. 6, the battery pack attachment portion 10 islocated at the front part of the motor housing 50 when the cuttingportion 4 is located at the proximity position. As illustrated in FIGS.3, 4 and 5, the left end portion of the motor housing 50 is locatedrightward relative to the left end portion of the battery pack 9 mountedon the battery pack attachment portion 10. In other words, the length ofthe battery pack 9 in the longitudinal direction is longer than thelengths of the motor 6 and the motor housing 50 in the longitudinaldirection. When the battery pack 9 is mounted to the battery packattachment portion 10, the electric power of the battery pack 9 can besupplied to the table-top cutting machine 1 via the connecting terminal58.

As illustrated in FIG. 1, the operating handle 53 is provided in frontof the battery pack attachment portion 10 and the motor housing 50, andis located above the cutting blade 8 when the cutting portion 4 islocated at the spaced position. The operating handle 53 has asubstantially D shape in a side view, and a switch trigger 53A forcontrolling turning on/off of the motor 6 is provided. The operatorgrasps the operating handle 53 and can move the cutting portion 4 fromthe spaced position to the proximity position.

The conveying handle 54 is provided behind the operating handle 53 andbehind the motor housing 50. The operating handle 53 and the conveyinghandle 54 are arranged side by side in the direction (a substantiallyfront-rear direction) parallel to the side surface of the cutting blade8 in a side view. The motor 6, the battery pack attachment portion 10,and the battery pack 9 are disposed between the operating handle 53 andthe conveying handle 54. The expression “between the operating handle 53and the conveying handle 54” means that, if assuming that a band shapepasses through the operating handle 53 and the conveying handle 54 inthe side view, at least a part of the member overlaps the band shape. Asillustrated in FIG. 6, the conveying handle 54 is substantiallyhorizontal when the cutting portion 4 is located at the proximityposition, and an operator easily grasps the conveying handle 54, whenconveying the table-top cutting machine 1 in a state in which thecutting portion 4 is fixed at the proximity position by a lock pin 35C.

The conveying handle 54 is provided with a conveyance grasping portion54A grasped by an operator when conveying the table-top cutting machine1. As illustrated by the two-dot chain line in FIG. 6, the upper endportion of the conveyance grasping portion 54A is located to be higherthan the battery pack 9 mounted to the battery pack attachment portion10. As a result, the size in the vertical direction is suppressed at thetime of conveyance, and the table-top cutting machine 1 can be conveyedin a compact state. A grasping hole 54 a is formed in the conveyinghandle 54, and when the cutting portion 4 is located at the proximityposition, the grasping hole 54 a extends substantially in the front-reardirection.

As illustrated in FIG. 3, the gear accommodating portion 55 is locatedon the right side of the motor housing 50. As illustrated in FIG. 1, thegear accommodating portion 55 is located at a position which overlapsthe motor housing 50 in a side view, between the operating handle 53 andthe conveying handle 54. A drive force transmission mechanism (notillustrated) is accommodated in the gear accommodating portion 55. Thedrive force transmission mechanism includes a plurality of gears totransmit the drive force from the motor 6 to the cutting blade 8. Asillustrated in FIGS. 1 and 2, the gear accommodating portion 55 isprovided with an illumination LED 55A extending forward and supported bya flexible support unit 55B. An operator can illuminate a desired placewith the LED 55A by operating the flexible support unit 55B.

A saw cover 56 is provided on the left side surface of the gearaccommodating portion 55 to cover the upper half of the cutting blade 8.A saw cover 56A is provided inside the saw cover 56 so as to berotatable about the output shaft 7, and the saw cover 56A covers theouter periphery of the lower side of the cutting blade 8 exposed fromthe saw cover 56. As illustrated in FIG. 1, the saw cover 56A covers theouter periphery of the cutting blade 8 exposed from the saw cover 56when the cutting portion 4 is located at the spaced position. Asillustrated in FIG. 6, when the cutting portion 4 is located at theproximity position, the saw cover 56A rotates about the output shaft 7by a link mechanism (not illustrated) and is accommodated in the sawcover 56 to expose the lower half of the cutting blade 8 from the sawcover 56.

As illustrated in FIG. 7, the motor 6 is a brushless motor. The motor 6includes: a motor output shaft 61, a rotor 62 fixed to the motor outputshaft 61, a stator 63 facing the rotor 62 in the radial direction of themotor output shaft 61, an inverter circuit 64 fixed to the left endportion of the stator 63, and a cooling fan 65 fixed to the motor outputshaft 61. As illustrated in FIG. 2, the motor output shaft 61 extends inthe left-right direction. A right end portion of the motor output shaft61 is engaged with a drive force transmission mechanism (notillustrated) accommodated in the gear accommodating portion 55, and aleft end portion of the motor output shaft 61 is rotatably supported bythe wall portion 52C.

As illustrated in FIG. 9, the rotor 62 includes two pairs of magnets,and the stator 63 is provided with a coil which faces the magnet. Theinverter circuit 64 includes six switching elements 64A for controllingthe driving of the motor 6, and a magnetic sensor 15 for detecting theposition of the stator 63. The magnetic sensor 15 is, for example, aHall element, and faces the rotor 62 in the left-right direction. Asillustrated in FIG. 4, the inverter circuit 64 is provided at the leftend portion of the stator 63. As illustrated in FIG. 5, in the axialdirection of the motor output shaft 61, the stator 63 and the invertercircuit 64 are disposed so as to be contained in the full length of thebattery pack 9. In other words, the battery pack 9 (the battery packattachment portion 10), the stator 63, and the inverter circuit 64overlap each other when viewed from a direction orthogonal to the motoroutput shaft 61 and passing through the battery pack attachment portion10.

In the cutting portion 4, a control circuit board (not illustrated)having a control unit 11 (FIG. 9) is provided. The control unit 11performs the drive control of the inverter circuit 64 and the control ofthe LED 55A. The inverter circuit 64 is electrically connected to themotor 6, the control unit 11, and the battery pack 9. A detectionresistor 12 for current detection, and a capacitor 13 connected inparallel with the battery pack 9 are provided along the path of thedrive current of the motor 6.

The control unit 11 includes a control power supply circuit 14, acurrent detection circuit 16, a switch operation detection circuit 17, avoltage detection circuit 18, a rotational position detection circuit19, a rotational speed detection circuit 20, an operation unit 41, and acontrol signal circuit 42. The control power supply circuit 14 convertsthe voltage of the battery pack 9 into a voltage suitable for theoperation of the control unit 11, and supplies the converted voltage tothe control unit 11. The current detection circuit 16 detects the drivecurrent of the motor 6 by the terminal voltage of the detection resistor12. The switch operation detection circuit 17 detects an operationamount of a switch trigger 53A operated by the operator. The voltagedetection circuit 18 detects the drive voltage of the motor 6 by thecapacitor 13. The rotational position detection circuit 19 detects therotational position of the motor 6, on the basis of a signal from themagnetic sensor 15. The rotational speed detection circuit 20 detectsthe rotational speed of the motor 6, on the basis of a signal from therotational position detection circuit 19. On the basis of the signalfrom the switch operation detection circuit 17, the operation unit 41sets a duty ratio of the PWM signal (hereinafter referred to as dutyratio) applied to each switching element 64A of the inverter circuit 64,in accordance with the operation amount of the switch trigger 53A. Theoperation unit 41 drives the control signal circuit 42, depending on theset duty ratio and the rotational position of the motor 6 detected bythe rotational position detection circuit 19, and switches and controlseach switching element 64A of the inverter circuit 64. The operationunit 41 calculates the rotational speed of the motor 6 on the basis ofthe detection result of the rotational position detection circuit 19,and detects the rotational speed of the cutting blade 8 from thedetection result of the rotational position detection circuit 19 on thebasis of the set reduction ratio of the motor 6 and the cutting blade 8.

A laser drive circuit 43 and an illumination LED drive circuit 44 areconnected to the control unit 11. The laser drive circuit 43 isconnected to the laser 43A, and illuminates the laser 43A on the basisof the operation of the laser switch 43B. The operator can cut the woodpiece W with reference to the laser beam emitted from the laser 43A. Theillumination LED drive circuit 44 is connected to the LED 55A, and turnson the illumination LED 55A on the basis of the operation of the LEDswitch 44A.

Next, the cutting operation of the table-top cutting machine 1 will bedescribed. The operator mounts the battery pack 9 on the battery packattachment portion 10 along the attachment-detachment direction D.Further, the switch trigger 53A is pulled, the motor 6 is driven torotate the cutting blade 8, and the operating handle 53 is pusheddownward to move the cutting portion 4 downward. At this time, when thecutting portion 4 swings in the clockwise direction as viewed from theleft side with respect to the swinging support portion 35 as the center(axis), the cutting portion 4 moves downward. The cutting blade 8 andthe wood piece W are brought into contact with each other to startcutting, and the cutting portion 4 slides with respect to the slidesupport unit 33 (the guide bars 33A and 33B), and the cutting portion 4is moved rearward to cut the wood piece W.

When the wood piece W is obliquely cut, both side surfaces of thecutting blade 8 are tilted with respect to the contact surface 25. Whenthe cutting portion 4 is tilted in the clockwise direction R of FIG. 2,the set pin 29 is completely retracted from the interior of the holder31 to loosen the clamp 31A. Alternatively, the set pin 29 may beretracted from the interior of the holder 31 after loosening the clamp31A. As a result, the support portion 3 and the cutting portion 4 can betilted in the counterclockwise direction L and the clockwise direction Rwith respect to the base portion 2. The maximum tilt angle of thecutting portion 4 tilted in one of the counterclockwise direction L orthe clockwise direction R is defined when the holder 31 abuts against astopper bolt (not illustrated). In order to set the maximum inclinedangle to 45□, a stopper bolt (not illustrated) is adjusted so that theholder 31 abuts against the holder 31 in a state of being inclined at45□.

As described above, the desktop cutting machine according to the firstembodiment of the invention has been described. According to such aconfiguration, the attachment-detachment direction D (FIG. 2) of thebattery pack 9 is in the swinging direction of the cutting portion 4,that is, the direction intersecting with (orthogonal to) the sidesurface of the cutting blade 8, the cutting portion 4 is restricted fromswinging during the attaching or detaching operation of the battery pack9, and the attaching or detaching operation can be easily performed.Further, the unintended swinging of the cutting portion 4 is suppressed,and the damage to the wood piece W placed on the base 21 can besuppressed.

Further, according to such a configuration, since the battery packattachment portion 10 can be provided in the motor housing 50, there isno need to separately prepare a housing which constitutes the batterypack attachment portion 10, and the number of components can be reduced,and the cutting portion can be downsized. Therefore, the battery packattachment portion 10 can be manufactured and assembled with a simpleconfiguration. Further, when lead wires are wired from the battery packattachment portion 10 to the motor 6, since the wiring can be performedwithout passing through other housings, the structure can be simplifiedand the assembling is also easy.

According to such a configuration, the first rail portion 51B isprovided in the first motor housing 51, and the second rail portion 52Bis provided in the second motor housing 52. Accordingly, the railportions can be manufactured without dividing in the longitudinaldirection and in the attachment-detachment direction of the batterypack. Therefore, the accuracy of the rail portions is secured, and thebattery pack 9 can be smoothly attached to and detached from the railportions.

Further, according to such a configuration, since the connectingterminal 58 is assembled so as to be interposed between the first motorhousing 51 and the second motor housing 52, there is no need for a metalfitting for attaching the connecting terminal 58 to the motor housing50. Thus, the motor housing 50 can be easily assembled, while reliablyholding the connecting terminal 58.

Further, according to such a configuration, since the display unit 57 isassembled so as to be interposed between the first motor housing 51 andthe second motor housing 52, there is no need for a metal fitting forattaching these components to the motor housing 50. As a result, themotor housing 50 can be easily assembled, while reliably holding thedisplay unit 57.

Further, according to such a configuration, since the protruding endportion of the motor housing 50 is positioned inside the battery pack 9,the full width of the small table-top cutting machine 1 can besuppressed.

Further, according to such a configuration, since the battery packattachment portion 10 is provided between the conveying handle 54 andthe operating handle 53, the distance from the battery pack attachmentportion 10 to both handles becomes shorter, and it is easy to grasp oneof the handles to stabilize the cutting portion 4 when holding thebattery pack 9.

Further, according to such a configuration, since the battery pack 9 islocated below the conveying handle 54 in a state (FIG. 6) in which thecutting portion 4 is fixed at the bottom dead center position, thetable-top cutting machine 1 can reduce the overall height at the time ofconveyance.

Further, according to such a configuration, the attachment-detachmentdirection D of the battery pack 9 is orthogonal to the sliding directionS of the cutting portion 4. Therefore, the cutting portion 4 is hard toslide by the attaching or detaching operation of the battery pack 9, andthe attaching or detaching operation of the battery pack 9 can be easilyperformed. Further, damage to the wood piece W placed on the base 21 canbe suppressed.

Further, by the configuration in which the motor 6, the connectingterminal 58, the inverter circuit 64, and the display unit 57 areaccommodated within the dimension in the longitudinal dimension(left-right direction) of the battery pack 9, the table-top cuttingmachine 1 can be downsized to provide the suppressed dimension (fullwidth) of the cutting portion 4 in the left-right direction.

Further, with such a configuration, since the configurations unique tothe DC-driven table-top cutting machine 1, such as the battery pack 9,the inverter circuit 64, and the display unit 57 are concentrated in themotor housing 50, the configuration other than the motor housing 50 canbe used in common with the cutting machine driven with AC. Therefore,the manufacturing cost of the table-top cutting machine 1 can bereduced.

In the above-described embodiment, the attachment-detachment direction Dof the battery pack 9 is a direction orthogonal to the side surface ofthe cutting blade 8, but the attachment-detachment direction may be adirection in which the attachment-detachment direction D intersects withthe side surface of the cutting blade 8. As a result, since thecomponent in the vertical direction in the mounting direction isreduced, the cutting portion 4 can be prevented from swinging.Hereinafter, modified examples thereof will be described.

Second Embodiment

A second embodiment which is a modified example of the invention will bedescribed with reference to FIGS. 10 to 12. The same configurations asthose in the first embodiment are denoted by the same referencenumerals, and description thereof will be omitted. In the secondembodiment, the attachment-detachment direction D of the battery pack 9is different from that of the first embodiment.

The motor housing 150 includes a first motor housing 151 and a secondmotor housing 152, and both are fixed to each other to form the batterypack attachment portion 110. The motor housing 150 is provided with aconnecting terminal 158. As illustrated in FIG. 11, the motor housing150 extends diagonally leftward and upward in the front view. Further,as illustrated in FIG. 10, when the cutting portion 4 is located at thespaced position, the motor housing 150 is inclined in the front-reardirection and is also inclined in the vertical direction. As illustratedin FIG. 12, when the cutting portion 4 is located at the proximityposition, the motor housing 150 is swung in the vertical direction. Asin the first embodiment, all of the motor housing 150, the motor outputshaft 61, the first rail portion 51B, and the second rail portion 52Bextend in the same direction.

As illustrated in FIG. 11, the attachment-detachment direction D2 of thebattery pack 9 is the diagonally leftward-upward direction in the frontview. The attachment-detachment direction D2 is the directionintersecting with the side surface (a vertical surface extending in thevertical direction) of the cutting blade 8. When the cutting portion 4is located at the proximity position (the state of FIG. 11), theattachment-detachment direction D2 is the direction in which thediagonally left upper side and the diagonally right lower side areconnected to each other. As illustrated in FIG. 10, when the cuttingportion 4 is located at the spaced position, the attachment-detachmentdirection D intersects with the sliding direction S. As illustrated inFIGS. 11 and 12, when the cutting portion 4 is located at the proximityposition, the attachment-detachment direction D is orthogonal to thesliding direction S. That is, when the cutting portion 4 is located atthe proximity position, the attachment-detachment direction D and thesliding direction S are substantially orthogonal to each other in theplan view.

According to such a configuration, when the cutting portion 4 is locatedat the proximity position, unintended sliding of the cutting portion 4can be suppressed. When the cutting portion 4 is tilted in thecounterclockwise direction L, since the distance between the motorhousing 150 and the base portion 2 increases, the cutting portion 4 canbe further tilted in the counterclockwise direction L. Furthermore,since a space can be secured between the cutting portion 4 and the baseportion 2 in a state where the cutting portion 4 is tilted in thecounterclockwise direction L, the battery pack 9 can be easily attachedand detached, and it is easy to check and operate the display unit.Furthermore, since the display unit 57 faces upward, it is easy to checkand operate the display unit.

The cutting machine according to the invention is not limited to theabove-described embodiment, and various modifications can be made withinthe scope of the invention. For example, the table-top cutting machine 1is used as a cutting machine in the disclosure, but a portable cuttingmachine can also be used.

In the above embodiment, the motor housing 50 is the two-split housingshaving the first mating surface 51A and the second mating surface 52Aextending in parallel to the axial direction of the motor output shaft61 of the motor 6 when viewed from a direction orthogonal to the motoroutput shaft 61, but the invention is not limited thereto. For example,the motor housing 50 may be an integrally molded motor housing or asplit type (two-split) housing having a mating surface orthogonal to theaxial direction of the motor output shaft.

In the above-described embodiment, the motor housing 50 is constitutedby two-split housings of the first motor housing 51 and the second motorhousing 52, but the invention is not limited thereto. The motor housing50 may be constituted by a housing divided into three or more sections.In that case, it is preferable that the connecting terminal and thedisplay unit are interposed by at least two of the housings divided intothree or more sections.

In the above-described embodiment, the battery pack attachment portion10 is provided in front of the motor housing 50 when the cutting portion4 is located at the proximity position (FIG. 6), but the invention isnot limited thereto. For example, the battery pack attachment portionmay be disposed behind the motor housing 50. Further, the battery packattachment portion may be disposed on either the first motor housing orthe second motor housing.

In the above embodiment, the motor 6 uses a brushless motor.Alternatively, a motor with a brush may be used.

In the above embodiment, the battery pack attachment portion 10 isprovided in the motor housing 50, but the invention is not limitedthereto. As long as the position is on the housing 5 of the cuttingportion 4, the battery pack attachment portion 10 can be provided at anyposition on condition that the attachment-detachment direction D of thebattery pack 9 is the direction intersecting with the side surface ofthe cutting blade 8. For example, the battery pack attachment portion 10may be provided in the operating handle 53, the conveying handle 54, ormay be provided in the gear accommodating portion 55.

The attachment-detachment direction of the battery pack 9 is not limitedto the above-described embodiment, and may be other directions as longas the direction intersects with the side surface of the cutting blade8.

In the above embodiment, the slide-type or tiltable table-top cuttingmachine 1 is used, but the invention is not limited thereto. Theinvention can also be applied to a cutting machine that does not use aslide mechanism or that is not tiltable. The slide structure is notlimited to the configuration in which the cutting portion 4 slides onthe guide bars 33A and 33B. Alternatively, the slide structure may havea configuration in which the cutting portion 4 and the guide bars 33Aand 33B slide together.

REFERENCE SIGNS LIST

1 . . . table-top cutting machine, 2 . . . base portion, 3 . . . supportportion, 4 . . . cutting portion, 5 . . . housing, 6 . . . motor, 7 . .. output shaft, 8 . . . cutting blade, 9 . . . battery pack, 10 . . .battery pack attachment portion, 21 . . . base, 27 . . . housing supportportion, 27A . . . tilting shaft portion, 35A . . . swing shaft, 33 . .. slide support portion, 33A,33B . . . guide bar, 36 . . . slideportion, 50,150 . . . motor housing, 51,151 . . . first motor housing,51A . . . first mating surface, 51B . . . first rail portion, 52,152 . .. second motor housing, 52A . . . second mating surface, 52B . . .second rail portion, 53 . . . operating handle, 54 . . . conveyinghandle, 53A . . . switch trigger, 57 . . . display unit, 57A . . .changeover switch, 58 . . . connecting terminal, 62 . . . rotor, 63 . .. stator, 64 . . . inverter circuit

What is claimed is:
 1. A cutting machine comprising: a cutting portioncomprising: a motor; a motor housing accommodating the motor therein; anoutput shaft rotatable upon rotation of the motor, a cutting blade beingdetachably attachable to the output shaft; a battery serving as a powersource of the motor; and a battery attachment portion including a pairof rail portions with which the battery is detachably attachable andengageable; a base having a contact surface on which a workpiece isconfigured to be placed; and a swing support mechanism connected to thebase and the cutting portion, the swing support mechanism including aswing shaft extending in parallel to the output shaft, the swing supportmechanism supporting the cutting portion such that the cutting portionis swingable about the swing shaft in a first direction between a topdead center and a bottom dead center, the first direction being adirection parallel to a side surface of the cutting blade, wherein thebattery is attachable to the battery attachment portion by slidinglymoving the battery in a second direction relative to the batteryattachment portion, the second direction crossing the first direction,wherein the cutting blade is rotatable about a rotational axis, andwherein the motor is provided such that a rotational shaft of the motoris inclined relative to the rotational axis.
 2. The cutting machineaccording to claim 1, wherein the cutting portion is slidingly movablein a sliding direction, and wherein the second direction crosses thesliding direction.
 3. The cutting machine according to claim 1, whereinthe battery is disposed at a position radially outward of the motor. 4.The cutting machine according to claim 1, further comprising a slidingsupporting mechanism supporting the cutting portion such that thecutting portion is slidingly movable in a sliding direction parallel tothe contact surface, wherein the cutting blade is rotatable about arotational axis extending in an axial direction, and wherein the batteryand the motor are provided at one side of the cutting blade in the axialdirection and the sliding supporting mechanism is provided at anotherside of the cutting blade in the axial direction.
 5. The cutting machineaccording to claim 1, wherein the cutting portion is slidingly movablein a sliding direction, and wherein, in a state where the cuttingportion is positioned at the bottom dead center, the second direction isperpendicular to the sliding direction.
 6. The cutting machine accordingto claim 1, further comprising: a sliding supporting mechanismsupporting the cutting portion such that the cutting portion isslidingly movable in a sliding direction parallel to the contactsurface; and a locking member configured to restrict the cutting portionin a proximity position from moving, the cutting portion in theproximity position being in proximity to the contact surface, wherein,in a state where the locking member restricts the cutting portion in theproximity position from moving, the second direction is perpendicular tothe sliding direction.
 7. A cutting machine comprising: a cuttingportion comprising: a motor; a motor housing accommodating the motortherein; an output shaft rotatable about a rotational axis upon rotationof the motor, a cutting blade being detachably attachable to the outputshaft; a battery serving as a power source of the motor; and a batteryattachment portion including a pair of rail portions with which thebattery is detachably attachable and engageable; a base having a contactsurface on which a workpiece is configured to be placed; a swing supportmechanism connected to the base and the cutting portion, the swingsupport mechanism including a swing shaft extending in parallel to theoutput shaft, the swing support mechanism supporting the cutting portionsuch that the cutting portion is swingable about the swing shaft betweena top dead center and a bottom dead center; and a sliding supportingmechanism supporting the cutting portion such that the cutting portionis slidingly movable in a sliding direction parallel to the contactsurface, wherein the battery is attachable to the battery attachmentportion by slidingly moving the battery in an attaching directionrelative to the battery attachment portion, the attaching directioncrossing an imaginary plane which is both parallel to and including aside surface of the cutting blade, wherein the cutting blade isrotatable about the rotational axis, and wherein the battery and themotor are provided at one side of the cutting blade in the axialdirection and the sliding supporting mechanism is provided at anotherside of the cutting blade in an axial direction of the rotational axis.8. The cutting machine according to claim 7, wherein the attachingdirection crosses the sliding direction.
 9. The cutting machineaccording to claim 7, wherein the battery is disposed at a positionradially outward of the motor.
 10. The cutting machine according toclaim 7, wherein, in a state where the cutting portion is positioned atthe bottom dead center, the attaching direction is perpendicular to thesliding direction.
 11. The cutting machine according to claim 7, furthercomprising a locking member configured to restrict the cutting portionin a proximity position from moving, the cutting portion in theproximity position being in proximity to the contact surface, wherein,in a state where the locking member restricts the cutting portion in theproximity position from moving, the attaching direction is perpendicularto the sliding direction.
 12. The cutting machine according to claim 7,further comprising a locking member configured to restrict the cuttingportion in a proximity position from moving, the cutting portion in theproximity position being in proximity to the contact surface, wherein,in a state where the locking member restricts the cutting portion in theproximity position from moving, the battery is positioned below an upperend of the cutting portion.
 13. A cutting machine comprising: a cuttingportion comprising: a motor; a motor housing accommodating the motortherein; an output shaft rotatable about a rotational axis upon rotationof the motor, a cutting blade being detachably attachable to the outputshaft; a battery serving as a power source of the motor; and a batteryattachment portion including a pair of rail portions with which thebattery is detachably attachable and engageable; a base having a contactsurface on which a workpiece is configured to be placed; and a swingsupport mechanism connected to the base and the cutting portion, theswing support mechanism including a swing shaft extending in parallel tothe output shaft, the swing support mechanism supporting the cuttingportion such that the cutting portion is swingable about the swing shaftbetween a top dead center and a bottom dead center, wherein the batteryis attachable to the battery attachment portion by slidingly moving thebattery in an attaching direction relative to the battery attachmentportion, the attaching direction crossing an imaginary plane which isboth parallel to and including a side surface of the cutting blade,wherein the motor is provided such that a rotational shaft of the motoris inclined relative to the rotational axis, and wherein the pair ofrail portions are inclined relative to the rotational axis.
 14. Thecutting machine according to claim 13, wherein the cutting portion isslidingly movable in a sliding direction, and wherein the attachingdirection crosses the sliding direction.
 15. The cutting machineaccording to claim 13, wherein the battery is disposed at a positionradially outward of the motor.
 16. The cutting machine according toclaim 13, further comprising a sliding supporting mechanism supportingthe cutting portion such that the cutting portion is slidingly movablein a sliding direction parallel to the contact surface, wherein thecutting blade is rotatable about a rotational axis extending in an axialdirection, and wherein the battery and the motor are provided at oneside of the cutting blade in the axial direction and the slidingsupporting mechanism is provided at another side of the cutting blade inthe axial direction.
 17. The cutting machine according to claim 13wherein the cutting portion is slidingly movable in a sliding direction,and wherein, in a state where the cutting portion is positioned at thebottom dead center, the attaching direction is perpendicular to thesliding direction.
 18. The cutting machine according to claim 13,further comprising: a sliding supporting mechanism supporting thecutting portion such that the cutting portion is slidingly movable in asliding direction parallel to the contact surface; and a locking memberconfigured to restrict the cutting portion in a proximity position frommoving, the cutting portion in the proximity position being in proximityto the contact surface, wherein, in a state where the locking memberrestricts the cutting portion in the proximity position from moving, theattaching direction is perpendicular to the sliding direction.